In two separate circulars, the exchanges said trading in the shares of these companies would be shifted to trade-to- trade settlement category from March 22.

The applicable price band shall be 5 per cent or lower, as per the circulars.

Members are requested to take adequate precaution while trading in the above securities, as the settlement shall be done on trade-to-trade basis and no netting off shall be allowed, the exchanges said.

On March 3, the bourses had listed more than 800 companies under graded surveillance measures framework to check any abnormal rise in stock price not commensurate with these firms financial health.

Under graded surveillance measures, the bourses can also ask the entities concerned to deposit an additional amount as surveillance deposit which can be retained for an extended period.